In this tutorial we are going to show you, how to use conditional tags in wordpress. We given code sample for wordpress theme. How to check page is subpage or parent page.

We got this particular requirement of wordpress menus. For that we need many times parent page menu and sub pages as submenu.

how to use conditional tags in wordpress

Using following code we can able to find the parent page and sub pages from wordpress themes. Following code we can put any where in page or code. We can put this code in header.php or index.php or footer.php or anywhere, as per our requirement.

<?php

global $post;&nbsp;&nbsp;&nbsp;&nbsp; // if outside the loop

if ( is_page() && $post->post_parent ) {

// This is a subpage

} else {

// This is not a subpage

}

?>

If you want use or add the is_subpage() method then you need to add the following code in functions.php file.

<?php

function is_subpage() {

global $post;&nbsp;// load details about this page

if ( is_page() && $post->post_parent ) {&nbsp; // test to see if the page has a parent

$parentID = $post->post_parent;&nbsp;// the ID of the parent is this

return $parentID;&nbsp;// return the ID

} else {&nbsp;// there is no parent so...

return false; // ...the answer to the question is false

};

};

?>

The Conditional Tags  are most useful in creating the wordpress themes and plugins. use of conditional tags in wordpress is necessary in custom themes. The Conditional Tags can be used in your Template files to change what content is displayed and how that content is displayed on a particular page depending on what conditions that page matches.

how to use of conditional tags in wordpress

Conditional tag will return the TRUE OR FALSE. Based on return value we can set the conditions. Some useful and most important conditional tags as follows:

is_home()

When the main blog page is being displayed.

is_front_page()

When it is the front of the site displayed, whether it is posts or a Page. Returns true when the main blog page is being displayed

is_admin()

When the Dashboard or the administration panels are being displayed.

is_single()

When any single Post page is being displayed.

is_single('17')

When Post 17 is being displayed as a single Post.

is_single('Irish Stew')

When the Post with Title “Irish Stew” is being displayed as a single Post.

is_single('beef-stew')

When the Post with Post Slug “beef-stew” is being displayed as a single Post.

is_single(array(17,'beef-stew','Irish Stew'))

Returns true when the single post being displayed is either post ID 17, or the post_name is “beef-stew”, or the post_title is “Irish Stew”.

is_page()

When any Page is being displayed.

is_page('42')

When Page 42 (ID) is being displayed.

is_page('About Me And Joe')

When the Page with a post_title of “About Me And Joe” is being displayed.

is_page('about-me')

When the Page with a post_name (slug) of “about-me” is being displayed.

is_page(array(42,'about-me','About Me And Joe'))

Returns true when the Pages displayed is either post ID 42, or post_name “about-me”, or post_title “About Me And Joe”.